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Temperature dependent stacking fault energy of FeCrCoNiMn high entropy alloy
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Material Physics.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Material Physics.ORCID iD: 0000-0001-7724-8299
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Material Physics.
Univ Sci & Technol Beijing, Dept Phys, Beijing 100083, Peoples R China..
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2015 (English)In: Scripta Materialia, ISSN 1359-6462, E-ISSN 1872-8456, Vol. 108, 44-47 p.Article in journal (Refereed) Published
Abstract [en]

The stacking fault energy (SFE) of paramagnetic FeCrCoNiMn high entropy alloy is investigated as a function of temperature via ab initio calculations. We divide the SFE into three major contributions: chemical, magnetic and strain parts. Structural energies, local magnetic moments and elastic moduli are used to estimate the effect of temperature on each term. The present results explain the recently reported twinning observed below room-temperature and predict the occurrence of the hexagonal phase at cryogenic conditions.

Place, publisher, year, edition, pages
2015. Vol. 108, 44-47 p.
Keyword [en]
High-entropy alloy, Stacking fault energy, Twinning, First-principles calculation
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-173754DOI: 10.1016/j.scriptamat.2015.05.041ISI: 000360250700011Scopus ID: 2-s2.0-84939776873OAI: oai:DiVA.org:kth-173754DiVA: diva2:856001
Funder
Swedish Research CouncilSwedish Foundation for Strategic Research VINNOVA
Note

QC 20150923

Available from: 2015-09-23 Created: 2015-09-18 Last updated: 2017-11-27Bibliographically approved
In thesis
1. Theoretical Investigations of High-Entropy Alloys
Open this publication in new window or tab >>Theoretical Investigations of High-Entropy Alloys
2017 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

High-entropy alloys (HEAs) are composed of multi-principal elements with equal or near-equal concentrations, which open up a vast compositional space for alloy design. Based on first-principle theory, we focus on the fundamental characteristics of the reported HEAs, as well as on the optimization and prediction of alternative HEAs with promising technological applications.

The ab initio calculations presented in the thesis confirm and predict the relatively structural stability of different HEAs, and discuss the composition and temperature-induced phase transformations. The elastic behavior of several HEAs are evaluated through the single-crystal and polycrystalline elastic moduli by making use of a series of phenomenological models. The competition between dislocation full slip, twinning, and martensitic transformation during plastic deformation of HEAs with face-centered cubic phase are analyzed by studying the generalized stacking fault energy. The magnetic moments and magnetic exchange interactions for selected HEAs are calculated, and then applied in the Heisenberg Hamiltonian model in connection with Monte-Carlo simulations to get further insight into the magnetic characteristics including Curie point. The Debye-Grüneisen model is used to estimate the temperature variation of the thermal expansion coefficient.

This work provides specific theoretical points of view to try to understand the intrinsic physical mechanisms behind the observed complex behavior in multi-component systems, and reveals some opportunities for designing and optimizing the properties of materials

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2017. 35 p.
National Category
Condensed Matter Physics
Identifiers
urn:nbn:se:kth:diva-218162 (URN)978-91-7729-544-0 (ISBN)
Presentation
2017-11-15, konferensrummet, Brinellvägen 23, Stockholm, 10:00 (English)
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Supervisors
Note

QC 20171127

Available from: 2017-11-27 Created: 2017-11-23 Last updated: 2017-11-27Bibliographically approved

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Li, WeiVitos, Levente

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